JP2003147651A - Heat-resistant composite spun yarn and fabric using the same - Google Patents

Abstract

(57) [Abstract] [Problem] Protective materials such as work gloves, arm covers, etc., which are elastic and stretchable, are soft and comfortable, have high cut resistance and heat resistance, and have excellent dyeability and colorful and vivid colors. It is intended to stably supply a composite spun yarn made of heat-resistant and high-performance fiber crimped yarn useful for outdoor sports clothing having an aesthetic property capable of being dyed. The heat-resistant and high-performance fiber is a core-sheath composite spun yarn in which a heat-resistant and high-performance fiber constitutes a core component, and the sheath component is composed of synthetic fiber, chemical fiber, or natural fiber short fiber. A composite spun yarn characterized by being a crimped yarn of a high-performance fiber filament yarn.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a core-sheath type composite spun yarn excellent in dyeing property, cut resistance, and stretchability, and a fabric which is excellent in stretchability and stretchability and is comfortable to wear. Regarding More specifically, the present invention relates to a composite spun yarn and a fabric suitable for use as a protective clothing used in a workplace where there is a high risk of cuts, abrasion melting, and burns, and a protective clothing material that can be worn in a harsh environment such as outdoor sports.

[0002]

2. Description of the Related Art In recent years, work efficiency, speeding up, and labor saving have progressed, the risk of labor and traffic accidents has increased, and there is a strong demand for improved safety from the viewpoint of respecting human life. On the other hand, in sports as well, the number of participants has increased and became active, and the number of people participating in outdoor sports such as snowboarding, fishing, and mountaineering has grown remarkably, and sports clothing materials are required to have more durability and functionality than ever before. In particular, it is desired to have excellent functionality such as cut resistance and heat resistance, and excellent aesthetics such as elasticity, pleating properties, wrinkle resistance, shape retention, and colorful colors. There is.

On the other hand, heat-resistant and high-performance fibers such as wholly aromatic polyamide fibers having high heat resistance, excellent cut resistance, high chemical resistance, and high yarn strength are widely used. For example, a mixture of 100% para-aramid fiber filament yarn and spun yarn partially interwoven is actually Kohei 1-3660.
No. 0, Japanese Patent Publication No. 62-26900, and Japanese Patent Laid-Open No. 2-26900.
It is proposed in Japanese Patent No. 292036. All of these have improved tear resistance and cut resistance, but since the para-aramid fiber is essentially a heat resistant fiber, it has poor heat setting property, and thus the filament yarn is not crimped. At present, there is a drawback in that the sewn garment has poor stretchability and stretchability, resulting in poor wearing comfort.

In general, heat-resistant and high-performance fibers such as wholly aromatic polyamide fibers are discolored by light, so that there is a problem in application to clothing such as sports clothes, work clothes, and outdoor wear.

Further, in JP-A-3-830, a core-sheath type composite spun yarn in which a para-aramid fiber is arranged in a core portion and a polyester fiber is arranged in a sheath portion, or a uniform blend of polyester short fibers and para-aramid short fibers is used. Japanese Unexamined Patent Publication No. 6-220730 and Japanese Unexamined Patent Publication No. 4-50340 for uniformly blending polyester short fibers, aromatic polyamide fibers, and cellulosic fibers have been proposed. However, under the present circumstances, it is not possible to obtain excellent stretchability and stretchability of spun yarns and fabrics using the spun yarns with the proposed conventional techniques.

[0006]

The object of the present invention is to have elasticity, stretchability, softness and comfort, cut resistance,
Consists of work gloves with high heat resistance, protective materials such as arm covers, and heat-resistant high-performance fiber crimped yarn useful for outdoor sports clothing that has excellent dyeability and aesthetics that can be dyed in colorful and vivid colors. It is intended to stably supply the composite spun yarn.

Another object of the present invention is to use such a composite spun yarn, which has excellent stretchability, stretchability and dyeability, and has a high cut resistance, such as a knitted or woven fabric, a fiber structure, a protective garment comprising the same, and a protective fabric. It is to provide a fabric that can be preferably used as a protective material such as a sheet.

[0008]

The core-sheath type long / short composite spun yarn of the present invention which achieves the above object has the following constitution.

(1) The heat-resistant and high-performance fiber constitutes the core component,
A core-sheath composite spun yarn having a sheath component composed of synthetic fibers, chemical fibers, or short fibers of natural fibers, characterized in that the heat-resistant and high-performance fiber is a crimped yarn of heat-resistant and high-performance fiber filament yarn. Composite spun yarn that does.

(2) The composite spun yarn according to (1) above, wherein the heat-resistant and high-performance fiber filament crimped yarn as the core component accounts for 10 to 40% by weight of the spun yarn.

(3) The composite spun yarn according to the above (1) or (2), wherein the proportion of the synthetic fiber or the natural fiber of the sheath component in the spun yarn is 60 to 90% by weight. .

(4) The composite spun yarn according to any of (1) to (3) above, wherein the heat-resistant and high-performance fiber filament crimped yarn as the core component has an expansion / contraction elongation ratio of 5 to 80%. .

(5) The heat-resistant and high-performance fiber filament crimped yarn has a single fiber fineness of 0.55 to 6.7 decitex,
The composite spun yarn according to any of (1) to (4) above, wherein the twist coefficient of the composite spun yarn is K = 2.6 to 6.0.

(6) The heat-resistant and high-performance fiber of the core component is a wholly aromatic polyamide fiber (1) to (5)
The composite spun yarn according to any one of 1.

(7) The composite spun yarn according to (6) above, wherein the wholly aromatic polyamide fiber as the core component is a para-type wholly aromatic polyamide fiber.

(8) The composite spun yarn according to (7) above, wherein the para-type wholly aromatic polyamide fiber is a polyparaphenylene terephthalamide fiber.

(9) A fabric comprising the composite spun yarn according to any one of (1) to (8) above in an amount of 30 to 100% by weight based on the weight of the fabric.

[0018]

As described above, according to the present invention, the heat-resistant and high-performance fiber filament crimped yarn is used as the core portion of the core-sheath type composite spun yarn, and the periphery thereof is made of synthetic fiber, chemical fiber, or natural fiber. Covered with a sheath component composed of short fibers, the core component heat-resistant high-performance fiber filament crimped yarn stretches,
Stretchability is improved, heat-resistant and high-performance fibers are placed in the core, and synthetic fibers with good dyeability or short fibers of natural fibers are used as sheaths on the surface of the composite yarn to improve dyeability and texture and cut resistance. The heat resistance is improved by the heat-resistant high-performance fiber filament crimped yarn of the core component.

The present invention will be described in detail below.

The heat-resistant and high-performance fiber of the present invention is preferably a fiber having flame retardancy with a limiting oxygen index of 25 or more and heat resistance with a thermal decomposition point of 400 ° C. or more. For example, wholly aromatic polyamide fiber, wholly aromatic polyester fiber [trade name, Vectran manufactured by Kuraray Co., Ltd.], polyparaphenylene benzobisoxazole fiber [trade name, manufactured by Toyobo Co., Ltd.,
Zylon], polybenzimidazole fiber, polyamideimide fiber [Rhone Poulenc Company, trade name Kermer] and the like. The wholly aromatic polyamide fibers include meta-aramid fibers and para-aramid fibers, and the former includes, for example, meta- wholly aromatic polyamide fibers such as polymetaisophthalamide fiber [Dupont, trade name Nomex]. . Examples of the latter include polyparaphenylene terephthalamide fiber [trade name Kevlar (R) manufactured by Toray-Dupont Co., Ltd.], and copolyparaphenylene-3,4'-oxydiphenylene terephthalamide fiber [trademark manufactured by Teijin Ltd. Name, Technora] and other para-type wholly aromatic polyamide fibers. Among them, polyparaphenylene terephthalamide fiber is desirable because it has high tensile strength, high cut resistance, flame retardancy, and high thermal decomposition point. Further, a meta-type wholly aromatic polyamide fiber which is flame-retardant and has a high thermal decomposition point is also preferable.

The above heat-resistant and high-performance fibers are used for clothing such as protective clothing and sportswear, and have low stretch, discoloration due to light, stain resistance, low pleating property, low wrinkle aesthetics, etc. There was a problem in terms of. The core-sheath composite spun yarn of the present invention impairs the functional properties of the heat-resistant and high-performance fiber, such as high tensile strength, high cut resistance (difficulty in cutting), flame resistance, and heat resistance such as high thermal decomposition point. Without improving the above problems, application to clothing such as protective clothing and sportswear can be realized. Heat-resistant high-performance fiber filament crimped yarn that improves stretchability is, for example, twisted after heat-resistant high-performance fiber filament yarn, wound on a heat-resistant bobbin such as aluminum, and treated for a predetermined time in a high temperature atmosphere within a specific temperature range. And set the heat to fix the twist. Then, it is obtained by subsequently untwisting by giving a twist in the direction opposite to the twist.

By using the crimped heat-resistant and high-performance fiber filament crimped yarn as the core of the composite yarn, the stretchability of the fabric is significantly improved.

A synthetic fiber having good dyeability and light resistance in the sheath,
Dyeability and light resistance are dramatically improved by wrapping crimped heat-resistant high-performance fiber filament crimped yarn in the core into a composite yarn that uses synthetic fibers such as recycled fibers and semi-synthetic fibers, or short fibers of natural fibers. To improve.

Cut resistance, which is a characteristic of heat-resistant and high-performance fibers,
Fully exhibiting heat resistance function, good stretchability,
In order to obtain dyeability and light resistance, as a result of various investigations, it is effective to dispose synthetic fibers, chemical fibers, or short fibers of natural fibers having good dyeability on the surface of the spun yarn and the fabric made of the spun yarn. Is high and optimal.

In addition, tailoring of clothes, pleating retention,
In order to improve shape retention such as wrinkle resistance, various studies were conducted on the composite spinning method of excellent thermoplastic fiber of polyester fiber and heat-resistant high-performance fiber. As a result, polyester fiber was added to the sheath portion of the core-sheath type composite spun yarn. The heat-resistant and high-performance fiber filament crimped yarns are arranged in the core so that the heat-resistant and high-performance fiber filament crimped yarns have cut resistance, heat resistance and stretchability, and polyester fiber thermoplasticity. The heat setting property of fibers can be effectively used.

Further, the heat-resistant and high-performance fiber filament crimped yarn used as the core component preferably has an expansion / contraction elongation ratio in the range of 5 to 80%. When the expansion / contraction expansion ratio of the heat-resistant and high-performance fiber filament crimped yarn, which is unfavorable because it does not give satisfactory stretchability, exceeds 80%, the heat-resistant and high-performance fiber filament crimped yarn has high elasticity, and the expression winding Composite workability and fabric workability are deteriorated due to shrinkage, which is not preferable. More preferably, the expansion / contraction elongation ratio of the heat-resistant high-performance fiber filament crimped yarn is in the range of 6 to 60%. More preferably, the expansion / contraction elongation ratio of the heat-resistant and high-performance fiber filament crimped yarn is 10 to 10.
It is in the range of 50%.

In the core-sheath composite spun yarn of the present invention, the core component is composed of heat-resistant and high-performance fiber filament crimped yarn, and the ratio of the heat-resistant and high-performance fiber filament crimped yarn of the core component to the spun yarn is 10 to 40. It is preferably composed of a range of weight%. 1 heat-resistant high-performance fiber filament crimped yarn
If it is less than 0% by weight, it becomes difficult to impart satisfactory heat resistance, cut resistance and stretchability to protective clothing. If the heat-resistant high-performance fiber filament crimped yarn exceeds 40% by weight,
It is difficult to sufficiently coat the heat-resistant high-performance fiber filament crimped yarn as the core component with the synthetic fiber, the chemical fiber, or the short fiber of the natural fiber as the sheath component, and it is not possible to obtain good dyeability and light resistance, which is preferable. Absent. The ratio of the heat-resistant and high-performance fiber filament crimped yarn of the core component to the spun yarn is 15 to 30.
The range of weight% is more preferable, and it may be selected according to the required protective clothing characteristics.

On the other hand, the sheath component is composed of synthetic fibers, chemical fibers, or short fibers of natural fibers. The proportion of the sheath component in the spun yarn is preferably in the range of 60 to 90% by weight. When the percentage of the sheath component synthetic fiber, chemical fiber or natural fiber short fiber in the spun yarn is less than 60% by weight, the core component It becomes difficult to sufficiently coat the heat-resistant and high-performance filament filament crimped yarn with the sheath component synthetic fiber, chemical fiber, or natural fiber short fiber, and the excellent dyeability of synthetic fiber, chemical fiber, or natural fiber However, it is not preferable because the light resistance cannot be sufficiently exhibited, and when the proportion of the sheath component in the spun yarn exceeds 90% by weight, the blending ratio of the heat-resistant high-performance fiber filament crimped yarn of the core component is low and sufficient. Stretchability, heat resistance and cut resistance that are satisfactory for protective clothing cannot be obtained, which is not preferable, and more preferably the proportion of the sheath component in the spun yarn is in the range of 65 to 80% by weight.

The short fiber bundle constituting the sheath component of the core-sheath composite spun yarn will be described. The short fiber bundle of the present invention is composed of synthetic fibers, chemical fibers, or short fibers of natural fibers. When heat resistance and cut resistance are strongly required, meta-aramid short fibers and wholly aromatic polyamide short fiber blended products are used. When high wear resistance is required, polyamide short fibers are used as pleats and shape retention. When short-circuiting is required, polyester short fibers are used. When hygroscopicity is required, cotton or rayon is used.

These short fibers used for the sheath component are not dyed, and may be dyed as a composite spun yarn or after being made into a fabric, or short dyed in advance may be used.

The synthetic fiber, the chemical fiber, or the natural fiber of the short fiber bundle which constitutes the sheath component is subjected to the usual short fiber spinning processes such as batting, carding, drawing, roving and spinning. It is a sliver or roving produced by passing it through. The fiber length may be increased (76 to 160 mm) and may be a sliver or roving thread that has been subjected to general saw wool spinning. The fineness of the short fibers is preferably 1.1 to 6.7 decitex, and 1.3 to 4.
4 decitex is more desirable. The fiber length is not particularly limited, but it is preferable to select the optimum fiber length according to the spinning method.

The heat-resistant and high-performance fiber filament crimped yarn of the present invention may be produced by any method. For example, as disclosed in JP 2001-248027 A,
It can be obtained by the following method. First, the first (either S or Z) twist is added to heat-resistant and high-performance fiber, and this is wound up on a heat-resistant bobbin such as aluminum, and then subjected to high-temperature and high-pressure steam treatment within a specific temperature range or for a predetermined time in a high-temperature atmosphere. A crimped yarn is produced by performing heat treatment to fix the twist, fixing the twist, and then applying a second twist (Z or S) in the opposite direction to the twist to untwist the twist.

It can also be obtained by twisting a para-aramid fiber having a water content of 15% or more, then heating and drying to set the twist, and then untwisting the twist number to almost zero.

At that time, the twist initially added is 16000 to 35000 as the value of the twist coefficient Kd represented by the following equation.

Twisting coefficient Kd = t × D ^1/2 [where t is the number of twists (times / m), D ^{1/2 is the} fineness including moisture (decitex)] It constitutes the core component of the core-sheath type composite spun yarn. The continuous yarn is a heat-resistant and high-performance fiber filament crimped yarn, and the filament yarn may be either a monofilament or a multifilament, but a multifilament yarn is more preferable from the viewpoint of composite processability and prevention of misalignment of the core and the sheath.

The twisting direction of the core-sheath composite spun yarn of the present invention is S,
Any of Z may be used, and the twist coefficient K (twist number = K × count ^1/2 ) is preferably slightly higher than that of general spun yarn in order to cover the core portion, and K = 2.6 to 6.0. Is desirable, K =
If it is lower than 2.6, the composite workability of the core and the sheath is deteriorated, which is not preferable. If it is higher than K = 6.0, strong twisting is excessive and double twisting is often generated, and the workability is deteriorated, which is not preferable. The range of K = 3.0 to 4.5 is more preferable.

Next, the method for producing the core-sheath composite spun yarn of the present invention will be described in more detail.

Although the manufacturing method is not particularly limited,
When the short fiber bundle of the sheath component is a sliver or roving, for example, by a ring spinning machine having a front top roller and a front bottom roller consisting of a pair of taper rollers, a back roller via a trumpet, an apron roller, and a front roller. Pass the continuous yarn of the core component through the guide to the side with the higher delivery amount and the side with the lower delivery amount of the front roller, then spun from the front roller at the same time as the short fiber bundle, and The fiber bundle is sequentially wound at the time of applying the actual twist to form the yarn in a state in which the continuous yarn of the core forming portion is wrapped in a twist shape.

FIG. 1 is a schematic view showing an example of a method for producing a core-sheath type composite spun yarn of the present invention. The outline of drafting and twisting of the spinning frame is shown below. Short fiber bundle A supplied to the spinning frame
Is supplied to the back roller 2 via the trumpet 1, and is passed through the apron draft 3 and is gripped by the pair of tapered front rollers 4 on the side where the delivery amount is high (the side where the diameter is large). On the other hand, the continuous yarn B is supplied through the guide 5 to the side where the front roller feed amount is low (the side where the diameter is small). The two components gripped by the front roller are combined in a range of 3 to 15 mm, and the ring 6 and the traveler 7 are used to give a true twist, and the wound yarn is wound into a tubular yarn by a usual method.
The interval when the core and sheath fiber yarns are combined is to change the difference in the delivery amount of both components, that is, the winding state of the short fiber bundle,
It is better to decide it by looking at the overlapping state and the physical properties of the composite yarn.

In the core-sheath type composite spun yarn of the present invention, the ratio of the heat-resistant high-performance fiber filament crimped yarn as the core component in the spun yarn is in the range of 10 to 40% by weight, and the heat-resistant high-performance fiber filament crimped Synthetic fibers of continuous yarn and short fiber yarn,
The core-sheath composite spun yarn of the present invention can be obtained by appropriately setting the composition ratio of the short fiber bundle of the chemical fiber or the natural fiber.

Next, the core-sheath type composite spun yarn of the present invention is a single yarn,
Alternatively, two or more single yarns may be aligned or twisted together to form a fabric such as a woven fabric or a knitted fabric as a twin yarn or a triple yarn, and 100% of the yarns may be used in the processing into a fabric. It is also possible to carry out knitting and weaving with filaments, processed yarns, elastic fibers and the like. Further, the composite spun yarn of the present invention may be used in a specific portion where heat resistance and cut resistance are required. The composite spun yarn of the present invention is made of the weight of the entire cloth such as a knitted woven fabric in order to show its characteristics effectively. 30-1
It is preferably used in the range of 00%, more preferably 50 to 100%, and most preferably 70 to 100%.
Is the range.

[0042]

EXAMPLES The present invention will be described in more detail below with reference to examples.

The method of measuring the characteristic values and the like in the examples is as follows. <Cut wound resistance (hardness to cut)> ASTM F1790-
97 Standard test method formeasing cut resis
It was measured according to the tance of material used in protective clothing. When the blade penetrates (cuts) the test piece with a certain movement distance, a heavier load is required for a material that is harder to cut. With the load L applied to the blade, the moving distance of the blade is 25.4.
When the blade penetrates the test piece in mm (1 inch), the load L is the cut resistance value. Blade is American Safety Razor C
o., product number No. 88-0121 was used. The measured value is N
It is expressed by (= Newton), and the larger the value, the more difficult it is to cut. <Pleatability> A sample with a length of 25 cm is cut out in the lengthwise direction of a woven or knitted fabric, marks are made at intervals of 5 cm in the lengthwise direction (4 places), 15 cm in the central part is folded, and the sample is tripled with a length of 5 cm. The sample is then cooled, and after pressing for 10 seconds at a pressing temperature of 140 ° C. and a pressing pressure of 0.5 kg / cm ² with a normal pressing machine, vacuum treatment is performed for 10 minutes to cool the sample. The pleating property (how to attach pleats) was visually judged. The criteria are as follows. (5th grade: very sharp pleats, 4th grade: sharp pleats, 3rd grade: there are pleats, 2nd grade: a little pleats, 1st grade: almost no pleats) Using the sample
The pleats of the samples after laundering were evaluated based on the IS L0217-103 method, and the results were classified as pleats retention. <Heat melting> Metal rod heated to 360 ° C (diameter 0.6
When a 6 × 6 cm sample is brought into horizontal contact with the tip of (cm) for 5 seconds under its own weight, the degree of perforation formed in the cloth by heat is compared with the cross-sectional area of the metal rod to judge the grade.

Grade 5: no perforation, Grade 4: 1/4 perforated,
Grade 3: 1/2 hole, Grade 2: 3/4 hole, Grade 1: Completely drilled. <Cloth texture (sensory evaluation)> The cloth was sensory evaluated in the following four stages. (⊚: soft and swelling with moderate tension and waist, ◯: good equivalent to this, Δ: soft feeling, lacking swelling, poor in hardness, ×: inferior in coarse hardness). <Expansion / contraction elongation> Measured in accordance with JIS L 1013: 1999 Chemical fiber filament test method 8.11 Elasticity. Preparation of the sample before measurement was performed as follows. 90 ° C with the measurement sample in the shape of a pouch and wrapped in a case
It was treated with warm water for 20 minutes and naturally dried at room temperature. <Tensile elastic modulus> Tensile elastic modulus of yarn (initial tensile resistance)
Was measured by the JIS L 1013: 1999 chemical fiber filament test method. <Limit oxygen index> JIS K 7201: 1999 Measured by a combustion test method for polymer materials according to the oxygen index method. <Pyrolysis point> JIS K 7120: 1987 It was measured by a thermogravimetric measurement method for plastics. <Fitness> (Elasticity) Based on the touch and wear feeling of 10 people who wear gloves, 60% or more of the 10 people judged that the fit was good, and the fit was judged to be good. Good fit, ○
Fair fit is normal △, poor fit is ×
Indicated by. <Stretchability> JIS L 1096 Stretchability 1999
It was measured by the general woven fabric test methods 8 and 14 and the elongation rate A method. <Dyeability (lightness L ^* )> L ^* is measured according to JIS Z 87.
I followed 29. Measuring instrument is M manufactured by Sumika Chemical Analysis Service Co., Ltd.
acbeth Color Eyes 3000 was used. When the same material is dyed with the same dye, the higher the dyeing ratio, the higher the lightness L ^* value of the material after dyeing.

[Example 1, Comparative Examples 1 and 2] Polyparaphenylene terephthalamide (hereinafter referred to as PPTA) having an intrinsic viscosity ηinh = 6.5 obtained by a usual method was 99.9.
% Concentrated sulfuric acid, polymer concentration 19.0%, temperature 8
After making the dope at 0 ° C., extruding from a die having a large number of pores with a pore diameter of 0.06 mm and passing an air gap of 6 mm,
Guide it to 4 ° C water to solidify it, and then guide it to a Nelson roller.
Neutralize with 10% aqueous sodium natrium solution, wash with water, slightly dry with a hot roller with a surface temperature of 110 ° C, and wind it up on a water-resistant bobbin. PPT of 111 decitex equivalent, single yarn fineness absolute dry equivalent 1.67 decitex equivalent)
A fiber yarn (1) was obtained.

The number of twists of this yarn is 1950 with a ring twisting machine.
Twist / m (Kd = 24800), twisting direction S twisting is added, then a bobbin with a yarn weight of 200 g is put in a hot air dryer and heat treated at 200 ° C. for 30 minutes, and then twisted with a ring twisting machine. A Z-twist 1 was applied and untwisted until the number of twists became 0, and a yarn (2) was obtained.

The thermal characteristics of the yarn (2) have a limiting oxygen index of 2
8, the thermal decomposition temperature was 537 ° C.

In the same process as the PPTA fiber yarn (1), the yarn dried with a hot roller having a surface temperature of 150 ° C. after being washed with water was wound up on a bobbin made of paper, and the moisture content was 4.5%.
Moisture-containing fineness of 116 decitex (111 decitex for dryness conversion, 1.67 decitex for single yarn fineness)
PPTA fiber yarn (3) was obtained.

The physical properties of these yarns are shown in Table 1. The larger the number of stretch / stretch ratios, the greater the stretchability of the yarn.

[0050]

[Table 1]

The PPTA fiber crimped yarn of the yarn (2) was a filament yarn having a large expansion / contraction elongation ratio of 29.0% and excellent elasticity. The PPTA fiber filament yarn in which the yarn (3) was not crimped had a small expansion and contraction rate of 0% and was inferior in elasticity.

In Example 1, the yarn (2), which is a crimped PPTA fiber, is used as a continuous yarn B and is fed through a guide to a low-feeding side of a ring spinning machine having a pair of front taper rollers. Then, one polyester fiber, 1.7 decitex, 38 mm raw cotton 100% short fiber bundle A roving yarn is fed from the back roller through the trumpet to the side where the front roller has a high feed amount, and the distance between both yarns is 5 mm. After adjusting the distance between the trumpet and the guide and the collector so that the roving yarn is drafted with a spinning total draft of 27.8 times, the roving yarn is combined with the continuous yarn B and twisted to form a tubular yarn in the usual manner. It was wound up to obtain a composite spun yarn in which the PPTA fiber crimped yarn is the core component. The yarn (2), which is a crimped PPTA fiber, was a yarn suitable for processability of the core-sheath composite spun yarn because the tension was easily controlled when it was supplied to the ring spinning machine.

The resulting composite spun yarn had a fineness of 295 decitex (corresponding to a cotton count of 20s / 1) and a twist number of 15.7 times / 2.
With Z twist of 5.4 mm, core component 37.6%, sheath component 6
It is a 2.4% core-sheath type composite spun yarn. The composite spun yarn was a core-sheath type composite spun yarn having a high stretch elongation rate of 6.7% and excellent in stretchability.

Next, this composite spun yarn was twist set at 90 ° C. for 20 minutes, and 60 warp yarns / 25.4 mm,
A plain weave (weight per unit area: 145 g / m ² ) of 100% composite spun yarn of 52 weft threads / 25.4 mm was prepared. A sizing agent was applied to the warp yarn during weaving.

The obtained woven fabric has a vertical elongation of 3.6%,
The fabric was as high as 3.8% wide, bulky, soft to the touch, supple, and excellent in texture, making it a suitable fabric for work clothes and sports clothing.

As Comparative Example 1, a core-sheath type composite spun yarn was prepared in the same manner as in Example 1 except that the core component was the yarn (3), that is, the PPTA fiber filament yarn which was not crimped. This composite spun yarn had a low expansion and contraction elongation rate of 0.2%. Then, using the same composite spun yarn, a woven fabric having the same woven structure as in Example 1 was obtained.

The obtained woven fabric has an elongation rate of 0.1% in the vertical direction,
The width was as low as 0.2%, which was harder than the woven fabric of Example 1, did not have a soft feel, and lacked in flexibility and was inferior in texture. As Comparative Example 2, Example 1 was repeated except that the PPTA fiber filament crimped yarn (2) used in Example 1 was used and the draft was 10 times and the twist number was 7.4 times / 25.4 mm. Fineness of 1180 decitex (cotton count 5s / 1 equivalent), core component 9.4%, sheath component 9
A core-sheath composite spun yarn having 0.6% of PPTA fiber crimped yarn as a core component was obtained.

The expansion / contraction elongation ratio of the obtained composite spun yarn is 0.5.
% Was low. Although the PPTA fiber crimped yarn is used as the core component, the elongation ratio was suppressed to be low because the ratio of the PPTA fiber crimped yarn to the whole composite spun yarn was small. After desizing and scouring these fabrics, they were dyed by the following method. Disperse dye Sumikaron Blue
4% by weight of E-FBL based on the weight of polyester fiber
The dyeing solution is prepared by adding 0.3 g / l of acetic acid as an auxiliary agent, and the bath ratio to the fiber weight is 1:20.
Dyeing was carried out at a dyeing temperature of 130 ° C. for 30 minutes. Then wash with hot water,
It was washed with water and dried. In Example 1 and Comparative Example 1, the polyester fiber of the sheath component was dyed to obtain a blue woven fabric. In Comparative Example 2, since the polyester component as the sheath component was small, a yellow woven fabric of PPTA fibers as the core component was obtained.

The results are shown in Table 2.

[0060]

[Table 2]

[Embodiment 2] The same composition as that used in Embodiment 1 is used.
Align two spun yarns and twist the yarn in the opposite direction to the 7
295 (decitex) after processing twin yarn with 0% twist number
× 2, (cotton number 20 ^S/ 2) was obtained. Furthermore, 5 of this
Align and align SFG-7 gauge type glove knitting machine (stock
Supplied to Shima Seiki Seisakusho Co., Ltd. and knit 7 gauge gloves
Raised, basis weight 530g / m²Made gloves.

[Comparative Example 3] Using the same composite spun yarn as that used in Comparative Example 1, a basis weight 53 was obtained in the same manner as in Example 2.
Gloves of 0 g / m ² were made.

[Comparative Example 4] Polyester spun yarn 295
A glove having a basis weight of 530 g / m ² was prepared in the same manner as in Example 2 using (decitex) × 2 (cotton number 20 ^S / 2). Table 3 shows the results of comparative evaluation of cut resistance, texture and fit property of these gloves.

[0064]

[Table 3]

The gloves of Example 2 were excellent in texture, good in flexibility, fit well in the hands, and good in cut resistance and heat resistance. The glove of Comparative Example 3 had good cut resistance and heat resistance, but was hard and had poor fit and poor wearing comfort.

[Examples 3 to 5] The 20s composite spun yarn of Example 1 was made to be 25% (Example 5), 30% (Example 2) and 100% (Example 3) of the total weight of the fabric. A plain woven fabric was prepared by uniformly using it for warp and weft. Polyester 100% 20s, K = 3.4 was used as a base yarn, and a sizing agent was applied to the warp during weaving. Weave density is 60 warps / 2
The weight was 5.4 mm, 52 wefts / 25.4 mm, and the basis weight was 145 g / m ² . The fabric evaluation results are shown in Table 4.

[0067]

[Table 4]

In Example 5 in which 25% of the yarn of the present invention was used, the shape retention such as pleating property was good, but the stretchability was slightly inferior, and the high-performance properties of the heat- and cut-resistant wholly aromatic polyamide fibers were slightly high. It was inferior. Example 3 and Example 4 are P
It was an excellent fabric that fully exhibited the high-performance characteristics of PTA fibers, had excellent stretchability, had a good fit, and had shape retention properties such as pleating properties.

The fabrics of Examples 3 and 4 were tailored into slacks and visually evaluated for tailoring, and the pleats were sharp pleats having polyester fibers. As a result of the wear evaluation performed by 10 people, it has not only heat resistance and cut resistance, but also stretchability, easy knee bending, and good pleating retention, which has been well received.

[0070]

INDUSTRIAL APPLICABILITY As described above, in the core-sheath type composite spun yarn and the fabric of the present invention, the continuous yarn comprising the heat-resistant high-performance fiber filament yarn crimped yarn constituting the core portion constitutes the sheath portion. By covering with synthetic fiber of short fiber bundle, synthetic fiber, or short fiber of natural fiber, heat-resistant and high-performance fiber filament yarn crimped yarn has elasticity and cut resistance,
It has significantly improved shape retention such as pleating property and wrinkle resistance without deteriorating excellent high-performance properties such as heat resistance, and has excellent stretchability, stretchability, excellent wearing comfort, and high-performance properties. It is possible to provide a cloth suitable for the field of protective clothing such as fire fighting clothes and work clothes, and outdoor sports clothing.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a method for producing a core-sheath composite spun yarn of the present invention.

[Explanation of symbols]

A: Short fiber bundle B: Continuous yarn 1: Trumpet 2: Back roller 3: Apron draft 4: Tapered front roller 5: Guide 6: Ring 7: Traveler

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Hatano             1-5-6 Nihonbashihonmachi, Chuo-ku, Tokyo             Toray DuPont Co., Ltd. Tokyo head office F-term (reference) 4L036 MA04 MA08 MA33 MA35 MA39                       PA31 RA04 RA24 UA07 UA16                 4L048 AA08 AA09 AA11 AA21 AA24                       AA25 AA33 AA48 AA49 AA50                       AA53 AA55 AB19 AC14 CA01                       CA02 CA06 CA09 DA03

Claims (9)

[Claims] 1. A core-sheath composite spun yarn in which a heat-resistant and high-performance fiber constitutes a core component and a sheath component is composed of synthetic fiber, chemical fiber, or short fiber of natural fiber, wherein the heat-resistant and high-performance fiber is A composite spun yarn, which is a crimped yarn of a heat-resistant and high-performance fiber filament yarn. 2. The composite spun yarn according to claim 1, wherein the ratio of the heat-resistant and high-performance fiber filament crimped yarn of the core component to the spun yarn is 10 to 40% by weight. 3. The composite spun yarn according to claim 1, wherein the proportion of the synthetic fiber or the natural fiber of the sheath component in the spun yarn is 60 to 90% by weight. 4. The composite spun yarn according to any one of claims 1 to 3, wherein the heat-resistant high-performance fiber filament crimped yarn as the core component has an expansion / contraction elongation ratio of 5 to 80%. 5. The heat-resistant and high-performance fiber filament crimped yarn has a single fiber fineness of 0.55 to 6.7 decitex and a composite spun yarn has a twist coefficient of K = 2.6 to 6.0. The composite spun yarn according to any one of claims 1 to 4, which is characterized. 6. The composite spun yarn according to claim 1, wherein the heat-resistant and high-performance fiber of the core component is a wholly aromatic polyamide fiber. 7. The composite spun yarn according to claim 6, wherein the wholly aromatic polyamide fiber of the core component is a para-type wholly aromatic polyamide fiber. 8. The composite spun yarn according to claim 7, wherein the para-type wholly aromatic polyamide fiber is a polyparaphenylene terephthalamide fiber. 9. A fabric comprising the composite spun yarn according to any one of claims 1 to 8 in an amount of 30 to 100% by weight based on the weight of the fabric.